<html> 
  <head> 
<!-- js -->
<script src="js/jquery-3.4.1.min.js"></script>  
<!-- //js -->    
<script> 
    $(function(){
      $("#includedContent").load("i_header.html"); 
    });
    </script> 
  </head> 

  <body> 
     <div id="includedContent"></div>
  </body> 
</html>